> On Aug 24, 2021, at 12:18 AM, Ian Haywood <[email protected]> wrote:
>
> I need to push messages to clients stuck behind a firewall. Existing
> solutions use polling of various forms. AMP would be perfect but for the 64k
> field size limit.
The 64k field size limit is a bit of a misnomer. It's a limit on the default
types, because you shouldn't be cramming huge values into messages in the
default case; every payload should be of finite size. It's not actually a
protocol-defined limit. There's no limit on message size, or even field size,
really, just individual key/value pair size.
You can trivially work around it yourself by defining a "large payload" type,
like this:
https://bazaar.launchpad.net/~glyph/+junk/amphacks/view/head:/python/amphacks/mediumbox.py
<https://bazaar.launchpad.net/~glyph/+junk/amphacks/view/head:/python/amphacks/mediumbox.py>
Perhaps something like this should be included within Twisted, which is much
less of a departure than this "v2" version of amp (which has a lot of interop
issues).
> There has been a previous attempt to address this
> (https://github.com/twisted/twisted/pull/1417) however this was reverted with
> a request to split the PR into the type annotations (presumably
> uncontroversial) and the protocol changes.
> The original contributor has done the type annotations
> (https://github.com/twisted/twisted/pull/1459) but they seem to be in "review
> queue hell" Can someone take a look and either merge it or specify what
> further work needs to be done?'
The best way to get stuff reviewed is to review other things in the queue to
keep it as small as possible :).
> With regard to the protocol changes there was discussion of using netstrings.
> Is there any interest in a AMPv2 based on netstrings?
I'd definitely prefer the netstrings version. (And an explicit
length-limitation in type signatures rather than depending on this somewhat
arbitrary 64k boundary. There should be a finite limit, but it should be
application-defined.)
-g
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